The Luth-AR AR-10/DPMS LR308/308 AR's complete Mil-spec carbine buffer assembly kit has everything you need in order to complete the rear end of your lower receiver. This kit is complete with a carbine buffer tube, Carbine buffer, carbine spring, endplate and castle nut. All the parts are made to mil-spec to ensure perfect fit and operation. Next time the need arises choose Luth-AR for your assembly parts.